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Home >> Subaru >> 2018 >> Impreza Base, 4D Sedan, Standard Trans >> Repair and Diagnosis >> Engine Mechanical >> Engine Control/Fuel System >> Fuel Injector >> Installation >> Fuel Injector LH

Fuel Injector LH

  1. Replace the following parts with new ones. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>Fuel Injector>REPLACEMENT .
    • Fuel injector seal
    • Slider washer
    • Backup
    • ring
    • O-ring seal
    • Stopper ring
  2. Install the fuel injector holder to the fuel injector assembly.
    Fig 1: Installing Fuel Injector Holder
    G11252816Courtesy of SUBARU OF AMERICA, INC.
  3. Align the protrusion of the fuel injector holder to the anti-rotation slot of the fuel injector pipe LH, and install the fuel injector to the fuel injector pipe LH.
    CAUTION:
    • Degrease inside of the fuel injector insertion hole of the fuel injector pipe.
    • Check the inside of the fuel injector insertion hole of the fuel injector pipe for foreign materials or damage.
    • Be careful not to allow gasoline to contact with the fuel injector seal and the inside of the mounting hole.
    • Apply liquid paraffin to the O-ring seal and install it.
    • In order to prevent damaging the O-ring seal, do not install the fuel injector to the fuel injector pipe by tilting or twisting it.
    • Make sure there is no gap between the fuel injector pipe and the fuel injector holder.
    Fig 2: Locating Protrusion Portion, Anti Rotation Slot And Gap
    G11252822Courtesy of SUBARU OF AMERICA, INC.
  4. Install the fuel injector. (Except for variable capacity A/C model)
  5. Install the fuel injector pipe LH and fuel injector as a single unit to the cylinder head.
    1. Insert the fuel injector pipe LH and fuel injector as a single unit into the cylinder head, and align their positions. Then, evenly press the sections (A) and (B).
      CAUTION:
      • When installing, apply liquid paraffin to the fuel injector seal.
      • In order to prevent damaging the O-ring seal, do not install the fuel injector pipe and fuel injector by tilting them toward the cylinder head.
      Fig 3: Installing The Fuel Injector Pipe LH And Fuel Injector
      G00570348Courtesy of SUBARU OF AMERICA, INC.
    2. Tighten the bolts which hold the fuel injector pipe LH, and connect the connector (A).

      Tightening torque: 

      19 N.m (1.9 kgf-m, 14.0 ft-lb)

      Fig 4: Locating LH Fuel Injector Pipe Bolts & Connectors
      G00570274
  6. Install the fuel injector. (Variable capacity A/C model)
    1. Connect the coupling harness to the fuel injector.
      Fig 5: Connecting Coupling Harness To Fuel Injector
      G00570277Courtesy of SUBARU OF AMERICA, INC.
    2. Insert the fuel injector pipe LH and fuel injector as a single unit into the cylinder head, and align their positions. Then, evenly press the sections (A) and (B).
      CAUTION:
      • When installing, apply liquid paraffin to the fuel injector seal.
      • In order to prevent damaging the O-ring seal, do not install the fuel injector pipe and fuel injector by tilting them toward the cylinder head.
      Fig 6: Installing The Fuel Injector Pipe LH And Fuel Injector
      G00570348Courtesy of SUBARU OF AMERICA, INC.
    3. Tighten the bolts which hold the fuel injector pipe LH, and connect the connector (A).

      Tightening torque: 

      19 N.m (1.9kgf-m, 14.0ft-lb)

      Fig 7: Locating LH Fuel Injector Bolts
      G00570273Courtesy of SUBARU OF AMERICA, INC.
    4. Connect the coupling harness to the engine wiring harness and fix with the tape (a).
      Fig 8: Locating Fuel Injector Connectors
      G11252813Courtesy of SUBARU OF AMERICA, INC.
  7. Install the high-pressure fuel delivery pipe. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>High Pressure Fuel Delivery Pipe>INSTALLATION>HIGH-PRESSURE FUEL DELIVERY PIPE .
  8. Install the high-pressure fuel delivery pipe assembly. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>High Pressure Fuel Delivery Pipe>INSTALLATION>HIGH-PRESSURE FUEL DELIVERY PIPE ASSEMBLY .
  9. Install the air intake boot. Ref. to AIR INTAKE BOOT .
  10. Connect the battery ground terminal. Ref. to REPAIR CONTENTS>NOTE>BATTERY .